The price of electricity to be delivered for the day ahead surged on 14 September as demand from air-conditioning during the current heatwave came in addition to a lull in wind power, while a number of gas and nuclear power stations were offline for maintenance.

The price jumped from the typical price of around £40/MWh to almost £200/MWh, the most expensive in a decade. Glenn Rickson, head of power analysis at Platts, said: “It seems to be the straw that broke the camel’s back this week.”

System operator National Grid admitted in a statement that the UK’s electricity supply was “a little tight” but said it was “completely manageable”. The company said it was comfortable it had enough power in reserve to keep the lights on.

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